One that I’d like to see is a more in-depth sorting option for posts (allowing you to see for example top of December 2020, or top of a specific day). A custom date range selection would be best. I remember this being a frequently requested feature in the early days of reddit, and they never implemented it.
In reply to my own comment I just noticed in this post that it seems to already be possible to cross-post. 🎉
I guess that leaves me with my second suggestion to add more docu or if it exists, make it more dicoverable.